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- 2 SheetsSheet l. R. G. BROWN. TELEGEAPHY.

(No Model.)

No. 446,425. Patented Feb. 17, 1891.

i @Q @Q WITNESSES (No Model.) I 2 SheetsSheet 2.

R. G. BROWN.

TELEGRAPHY.

Patented Feb. 1891.

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ROBERT G. BROIVN, OF BROOKLYN, ASSIGNOR TO THE STANDARD MULTI- -PL EX TELEGRAPH COMPANY, OF NEW' YORK, N. Y.

TELEGRAPHY.

SPECIFICATION forming part of Letters Patent No. 446,425, dated February 1'7, 1891.

Application filed March 6, 1886- .[0 all whom it may concern:

Be it known that I, ROBERT G. BROWN, a citizen of the United States, residing at Brooklyn, county of Kings, and State of New York, have made a new and useful Invention in Telegraphy, of which the following is a specification.

My invention relates particularly to improvements in multiplex telegraphs, and its object is to devise a telegraphic system of this type in which messages may be trans mitted in either direction at will over a single line to a series of receiving-instruments located at a great distance; and to this end it consists in the method of transmitting telegraphic messages over multiplex synchronous telegraphic linesin either direction at wi11,as hereinafter described, but particularly pointed out in the claim which follows this specification.

In order to accomplish this result I make use of the statical discharge of a telegraphic line, and so arrange the multiplex synchronous trailers and their successive contacting segments that the ratio of the distances between the transmitting-segments at each end of the line and the segments to which the receiving apparatus is attached is such that the distance between said segments bears a proportional ratio to the length of the line.

I make no claim to the method of transinittin g messages telegraphically through segments so arranged that they bear a fixed relation to the length of the line, as this the invention of Patrick E. Delany.

In the accompanying drawings, Figure 1 is a diagram View showing a base-board and a table of contacts or segments arranged thereon; and Fig. 2 is a diagram view showing portions of a table of contacts at two connected stations,with the local-circuit connections and instruments for two pairs of operators.

On the table illustrated in Fig. 1 I have shown one hundred and forty-four messagesegments and six groups of four small seg ments disposed at equal intervals around the table, which latter segments are devoted to maintaining the synchronous movement of the apparatus. Th ese eorrectingsegments,

Serial No. 194,303. (No model.)

as they are termed, are referred to hereinafter. For the present it will be assumed that the apparatus at the two stations are running synchronously.

In Patent No. 286,273, granted to P. B. Delany, October 9, 1883, there are shown and claimed what are called static discharge contacts arranged between the message segments or contacts. Their function is to discharge the line after each break, so that the line will be in proper condition for the reception of the impulse from the battery which willpass into the line when the trailers at the two stations come upon the next pair of corresponding segments. I dispense with such ground or discharge contacts and use a supplementary message contact or segment which occupies the position of the ground or static discharge contact shown in the Delany patent.

Referring now to the particular organization illustrated in the drawings, Fig. 1 is a diagram View illustrating a circle of segments full size and adapted for sextuplex transmission. The binding-screws 1 1 2 2 850., rep resent the operators connections, each operators instrument being connected with a pair of the binding-screws, for a purpose which presently appears. In this View the segments for operator N o. 1 only are shown arranged in pairs to and a such pairs being placed at twelve equal intervals in the circle of segments. All the contacts a of the pairs of segments are connected together and to the binding-post 1, while all the other segments a of the pairs are connected together and to the binding-post 1 Fig. 2 shows the connection of each operators instruments with his pairs of segments. The segments and operators instruments are similarly connected at both stations.

Referring now specially to Fig. 2, at each station X Y is shown a portion merely of the circle of segments. The instruments of two pairs of corresponding operators, however, No. 1. and No. 2, are shown as connected each with one of the pairs of segments devoted to their use. The first segment a in each pair is preferably smaller than its mate a and is connected with a transmitting-armature l3, which is normally put to ground through its upper contact Z), and maybe connected with a main battery MB by the action of a magnet 0 included in a local circuit in which the transmitting-keyK is placed. \Vhen the operator No. 1 at station X works his key, therefore, the main battery MB is thrown upon the line through the battery-segment (Land trailer or cirouit-completer 3 At the opposite station Y, assuming that operator No. 1 is receiving, the segment a is connected to earth through the armature Bandits upper contact b. A complete circuit is therefore atforded and the current from the battery MB at X promptly enters the line. If the line is so short as to permit the current which enters the line at X to reach the ground at Y, no effect will be produced upon the relay of operator No. 1 at station Y, while the trailers are still upon the segments a; but when the synchronously-moving trailers pass from the segments a at each station the primary batterycircuit is broken, and when the trailers come upon the segments a the static charge on the line discharges. The discharge from the line takes place in exactly the same way if the line is so long that the primary current cannot reach the contact a. At the sendingstation X, the transmitter armature-lever of operator No. 1 having been drawn down, as described, the parts will be in the position indicated by the apparatus of operator No. 2 at that station, and the static discharge passes from the segment a by a wire cl to an insulated spring-finger e on the armature B to a stop-pin e to earth, preferably through a resistance Rh, as shown. At the apparatus of operator No. 1 at station Y the discharge passes by a wire f from segment a to an insulated spring-finger e on the armature l3, and the armature B being in its normal position the spring-finger c is in contact with an insulated section E of the armature, which is connected through the relay R to earth The static discharge,therefore, or the group of such discharges in this particular system of telegraphy, will manifest itself upon the receivingrelay R and produce the desired signal. The resistances Rh are employed, by preference, to prevent sparking between the battery-segment or contact and its mate when the trailer bridges from one of the segments to the other. The arrangement of spring-finger e, stop 6', and insulated section E of the armature-lever B is such that when the armature moves away from its upper contact Z) the spring-finger e is disconnected from the armature-section E and put in contact with the stop 6 just before the armature-lever B is connected with the main battery M13. The dark lines which separate the pairs of segments indicate strips of insulating materialsuch as ivory or strips of some insulated material-which, being arranged flush with the faces of the segments, prevent the trailer from short-circuiting the main battery of one operator through the receiving-relay of the adjoining operator as the trailer passes from a receiving'segment to a battery-segment.

Referring to the three groups of correcting-segments s in Fig. 1,the first segments in the groups are connected together and to a binding-post s, the second segments are similarly connected to abindingpost the third to a binding-post s, and the fourth to a binding-post s. The segments of the other three groups of correcting-segments 'U are sumlarly connected each to a binding-post o 0 The arrangement at the other station may be just the same, except that the respective positions of the groups of segments .9 U are reversed.

If the line is a short one, the correctingsegments may be connected as follows: The post .9 being connected with the correctingbattery OB, the first segment in each group 3 will be in connection with the battery. One or more of the remaining three segments in each group may be grounded. The correcting impulse from the battery CE is therefore sent to the distant station through the first segment in each group of correcting-segments 8.

The other groups of correcting-segments n, which receive the impulses from the distant station, may be corrected as follows: The second segment in each group is connected to ground through the correcting -relay by grounding the binding-post 1: as shown. The first segment and the last two may be put direct to ground. On longer lines the segments .9 may be connected as before described, but of the receiving-segments v the first two and the last may be put to ground and the correcting-relay connected to the third. On still longer lines the first two segments of the groups 3 may be connected to the battery and the correcting-relay connected with the last segments in each group Q), the other segments in each groupc being grounded, if desired. These segments might be connected in any other way to accomplish the purpose. If all the segments 3. were connected with the battery OB and all the segments 1) with the correcting-relay, the operation of correction would be analogous to the operation described in Delaneys patents before mentioned; but when connected in the way I have described the correction of the apparatus will be effected by the static discharge from the line.

No claim is made herein to any of the details of construction or organization, as they form the subject-matter of another application filed by me simultaneously herewith.

I claim as my invention- The described method of transmitting messages in either direction at will over a single main line connecting two or more multiplex In testimony whereof I have hereunto subscribed my name.

ROBERT G. BROWN XVitnesses:

J. A. F. SIMPSON, WM. W. WIGHT. 

